This circuit is from a 1976 Motorola CMOS manual. It can be implemented with modern Darlingtons like those in the Texas TIP series. The load current depends only on the Darlington transistor.
This is the circuit of a commercial amplifier sold in Japan in the 1960s. The circuit for hearing aid...
This circuit with variable capacitance diode (varicap) is from a publication from the 90s. The...
In the figure we have a simple pulse generator using a unijunction programmable transistor. The...